@Sparticus: Huh? According to the internet ;-) , a basement is "one or more floors of a building that are either completely or partially below the ground floor", while a cabin is "a small, roughly built house usually with a wood exterior". I don't see the problem with a cabin having a basement.

Besides... how do you know that they are in the "Cabin in the Woods"? They may have taken a pit stop at the "shanty in the coppice" before going to their final destination.